package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.ObjectUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.constant.UserConstant;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.manage.auth.StpKit;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVo;
import com.yupi.yupicturebackend.model.vo.UserVo;
import com.yupi.yupicturebackend.service.UserService;
import com.yupi.yupicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author wyy
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-09-17 19:49:59
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
        implements UserService {

    /**
     * 用户注册
     *
     * @param userAccount   用户账户
     * @param userPassword  用户密码
     * @param checkPassword 校验密码
     * @return 新用户 id
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        //1、校验参数
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }

        //2、检查账号是否重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<User>()
                .eq("userAccount", userAccount);
        long count = this.baseMapper.selectCount(queryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }

        //3、密码加密
        String encryptPassword = getEncryptPassword(userPassword);

        //4、插入数据
        User user = new User();
        //用户名
        user.setUserAccount(userAccount);
        //密码
        user.setUserPassword(encryptPassword);
        //默认用户名
        user.setUserName("无名");
        //默认普通用户
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean save = this.save(user);
        if (!save) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败");
        }

        //返回数据
        return user.getId();
    }

    /**
     * 用户登录
     *
     * @param userAccount  用户账户
     * @param userPassword 用户密码
     * @param request      请求
     * @return 脱敏后的用户信息
     */
    @Override
    public LoginUserVo userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1、校验参数
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号错误");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码错误");
        }

        //2、密码加密
        String encryptPassword = getEncryptPassword(userPassword);

        //3、查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<User>()
                .eq("userAccount", userAccount)
                .eq("userPassword", encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        //不存在，则抛出异常
        if (user == null) {
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }

        //4、记录用户登录态
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE, user);
        //记录用户登录态到 Sa-token，便于空间鉴权时使用，注意保证该用户信息与 SpringSession 中的信息过期时间一致
        StpKit.SPACE.login(user.getId());
        StpKit.SPACE.getSession().set(UserConstant.USER_LOGIN_STATE, user);

        return this.getLoginUserVo(user);
    }

    /**
     * 获取当前登录用户
     *
     * @param request 请求
     * @return 当前登录用户
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        //1、判断用户是否已登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }

        //2、从数据库查询
        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    /**
     * 获取加密密码
     *
     * @param userPassword 用户密码
     * @return 加密密码
     */
    @Override
    public String getEncryptPassword(String userPassword) {
        //加盐，混淆密码
        String SATL = "yupi";
        return DigestUtils.md5DigestAsHex((SATL + userPassword).getBytes());
    }

    /**
     * 获取脱敏后的登录用户信息
     *
     * @param user 用户信息
     * @return 脱敏后的用户信息
     */
    @Override
    public LoginUserVo getLoginUserVo(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVo loginUserVo = new LoginUserVo();
        BeanUtil.copyProperties(user, loginUserVo);
        return loginUserVo;
    }

    /**
     * 用户注销
     *
     * @param request 请求
     * @return 是否注销成功
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        //1、判断用户是否已登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        if (userObj == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }

        //2、移除登录态
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }

    /**
     * 获取脱敏后的用户信息
     *
     * @param user 用户信息
     * @return 脱敏后的用户信息
     */
    @Override
    public UserVo getUserVo(User user) {
        if (user == null) {
            return null;
        }
        UserVo userVo = new UserVo();
        BeanUtil.copyProperties(user, userVo);
        return userVo;
    }

    /**
     * 获取脱敏后的用户列表
     *
     * @param userList 用户列表
     * @return 脱敏后的用户列表
     */
    @Override
    public List<UserVo> getUserVoList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream()
                .map(this::getUserVo)
                .collect(Collectors.toList());
    }

    /**
     * 获取查询条件
     *
     * @param userQueryRequest 用户查询条件
     * @return 查询条件
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        //1、校验参数
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }

        //2、获取查询条件
        Long id = userQueryRequest.getId();
        String userName = userQueryRequest.getUserName();
        String userAccount = userQueryRequest.getUserAccount();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<User>()
                .eq(ObjectUtils.isNotNull(id), "id", id)
                .eq(StrUtil.isNotBlank(userRole), "userRole", userRole)
                .like(StrUtil.isNotBlank(userName), "userName", userName)
                .like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount)
                .like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile)
                .orderBy(StrUtil.isNotEmpty(sortField), "ascend".equals(sortOrder), sortField);

        return queryWrapper;
    }

    /**
     * 校验用户是否为管理员
     *
     * @param user 用户
     * @return 是否为管理员
     */
    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }
}




